cyclization strategy has been established, allowing a flexible, practical and regiospecific approach to 23 examples of 1,5,6,7-tetrahydro-4H-indol-4-ones from low-cost and readily accessible β-hydroxyketones and cyclic enaminones. Notably features of this work include broad functional group compatibility, mild reaction conditions and good reaction yields.
已经建立了一种新的p -TsOH促进的脱羟基[3 + 2]环化策略,该方法可以灵活,实用且对区域特定的方法来处理23个来自1,5,6,7-tetrahydro-4 H -indol -4- one的实例低成本且易于获得的β-羟基酮和环状烯胺酮。这项工作的显着特点包括广泛的官能团相容性,温和的反应条件和良好的反应收率。
Spirocyclization and Michael addition of 3-benzylidene succinimides: route to spirocyclopentapyrrolidine-tetraones and benzylidene <i>N</i>-arylpyrrolidine-diones
作者:Pooja Dahiya、Anoop Yadav、Rama Krishna Peddinti
DOI:10.1039/d3ob01629c
日期:——
Reactions of 3-benzylidene succinimides with 2-substituted 2-hydroxy-indane-1,3-diones and unsaturated pyrazolones are carried out under basic conditions to afford spirocyclized derivatives and Michael adducts, respectively, with high regio- and stereo-selectivities. The most notable aspect of the reaction is the ability of highly reactive benzylidene succinimide to act as both an electrophile and
A practical and efficient regioselective synthesis of pyrrolo-fused polyheterocycliccompounds from 2-substituted-2-hydroxy-indane-1,3-diones and 1,4-benzoxazinones via intramolecular [3+2] cycloaddition has been demonstrated. The protocol obviates column chromatography and products were isolated in good to excellent yields by simple filtration. Electronic effects of both electron-releasing and electron-withdrawing